I first threw this casserole together at a campsite in the Smokies, using whatever we had left in the cooler. The name 'Olivia' came from a friend's daughter who devoured it faster than the adults. Back home, I refined it into this creamy, golden-topped wonder that's become a weeknight staple.
Advertisements1
It's the kind of dish that feels like a warm hug on a cold evening – tender chicken, earthy mushrooms, and a rich, savory sauce, all under a crispy panko crust. Plus, it comes together in one skillet and bakes in the oven, so you're not juggling a million pots.
Whether you're a seasoned home cook or just starting out, this casserole is forgiving and adaptable. Grab a cold one, crank up some tunes, and let's make dinner happen.
Why You'll Love This Recipe
About the Ingredients
1.5 lbs (680g) boneless, skinless chicken breasts, cut into 1-inch cubes
Chicken thighs work too – they're even juicier. If using frozen, thaw completely and pat dry.
2 tbsp (30ml) olive oil
For searing the chicken. Avocado oil is a great high-heat substitute.
8 oz (225g) cremini mushrooms, sliced
White button mushrooms are fine, but cremini add more earthiness. Swap in baby bellas.
1 small yellow onion, diced
About 1 cup. Shallots or leeks work for a milder flavor.
3 cloves garlic, minced
Use a garlic press for speed. Jarred minced garlic works in a pinch.
1 tsp dried thyme
Fresh thyme – use 1 tbsp chopped – is even better. Oregano or rosemary are good swaps.
1 tsp salt
Adjust to taste. Kosher salt is best for even seasoning.
0.5 tsp black pepper
Freshly ground is more aromatic. White pepper for a milder kick.
1 cup (240ml) chicken broth
Low-sodium is best so you control the salt. Vegetable broth works too.
1 cup (240ml) heavy cream
Half-and-half lightens it up, but the sauce won't be as rich. For dairy-free, use full-fat coconut milk.
1 cup (100g) grated Parmesan cheese
Freshly grated melts better than pre-shredded. Pecorino Romano is a sharp sub.
1 cup (120g) panko breadcrumbs
Regular breadcrumbs work, but panko gives that extra crunch. Crushed Ritz crackers are a buttery alternative.
2 tbsp (28g) unsalted butter, melted
For mixing with panko. Olive oil works if you're out of butter.
Tips & Tricks
- Don't skip searing the chicken – it builds flavor and keeps the meat juicy.
- If the sauce seems too thin before baking, whisk in a slurry of 1 tbsp cornstarch and 2 tbsp water.
- Cover with foil if the top browns too quickly – you want a golden crust, not a burnt one.
- Let the casserole rest for 5 minutes after baking so the sauce sets up and servings hold their shape.
Pro Tips
Step-by-Step Instructions
1. Preheat and Prep
Preheat your oven to 375°F (190°C). Pat the chicken cubes dry with paper towels and season with salt and pepper.
2. Sear the Chicken
Heat olive oil in a large oven-safe skillet over medium-high heat. Add chicken in a single layer and cook for 4-5 minutes per side until golden brown but not cooked through. Remove to a plate – it will finish in the oven.
3. Sauté the Aromatics
In the same skillet, add mushrooms and onion. Cook for 5-6 minutes until softened and browned. Stir in garlic and thyme and cook for 30 seconds until fragrant.
4. Build the Sauce
Pour in the chicken broth, scraping up any browned bits from the bottom. Bring to a simmer and let reduce by half, about 3-4 minutes. Stir in the heavy cream and bring back to a gentle simmer.
5. Add Cheese and Chicken
Turn off the heat and stir in the Parmesan until melted. Return the chicken to the skillet, coating it evenly with the sauce.
6. Top with Panko
In a small bowl, mix the panko breadcrumbs with the melted butter. Sprinkle evenly over the casserole.
7. Bake to Golden Perfection
Transfer the skillet to the oven and bake for 20-25 minutes, until the topping is golden brown and the edges are bubbling. The internal temperature of the chicken should reach 165°F (74°C).
8. Rest and Serve
Remove from the oven and let rest for 5 minutes. Garnish with fresh parsley if desired, then serve warm.
Delicious Variations
- Swap the chicken for leftover turkey – perfect after the holidays.
- Add a cup of frozen peas or spinach during the last 5 minutes of baking for a veggie boost.
- Make it spicy with a pinch of red pepper flakes or a dash of hot sauce in the sauce.
How to Store Chicken Olivia Casserole
Refrigerator
Store in an airtight container for up to 4 days.
Freezer
Freeze for up to 3 months. Thaw overnight in the fridge before reheating.
Reheating
Reheat in a 350°F (175°C) oven for 10-15 minutes, or microwave in 30-second bursts until hot.
Frequently Asked Questions
Q: Can I use chicken thighs instead of breasts?
Yes, chicken thighs work great and are even more forgiving. Just adjust the cook time slightly – they may need an extra 5 minutes in the oven to reach 165°F.
Q: Can I make this casserole ahead of time?
Absolutely. Assemble the casserole up to the point of baking, cover, and refrigerate for up to 24 hours. When ready, bake as directed, adding 5-10 minutes to the oven time since it starts cold.
Q: What can I substitute for heavy cream?
Half-and-half or whole milk mixed with a tablespoon of flour will work for a lighter sauce. For a dairy-free option, use full-fat coconut milk – it adds a subtle sweetness.
Q: How do I know when the casserole is done?
The topping should be golden brown and the edges bubbly. The most reliable test is an instant-read thermometer – the chicken should read 165°F (74°C) in the thickest piece.
Q: What sides go well with Chicken Olivia Casserole?
A simple green salad, roasted asparagus, or crusty bread to soak up the extra sauce are all great choices. It's also hearty enough to stand alone.
If you love this recipe as much as I do, share your twist in the comments below. And don't forget to subscribe for more campfire-approved meals. Get out there and explore.
Chicken Olivia Casserole
Chicken Olivia Casserole is a creamy, cheesy, and comforting dinner that's perfect for busy weeknights and guaranteed to please the whole family.
🧂 Ingredients
- 1.5 lbs (680g) boneless, skinless chicken breasts, cut into 1-inch cubes
- 2 tbsp (30ml) olive oil
- 8 oz (225g) cremini mushrooms, sliced
- 1 small yellow onion, diced
- 3 cloves garlic, minced
- 1 tsp dried thyme
- 1 tsp salt
- 0.5 tsp black pepper
- 1 cup (240ml) chicken broth
- 1 cup (240ml) heavy cream
- 1 cup (100g) grated Parmesan cheese
- 1 cup (120g) panko breadcrumbs
- 2 tbsp (28g) unsalted butter, melted
📋 Instructions
- 1Preheat and Prep — Preheat your oven to 375°F (190°C). Pat the chicken cubes dry with paper towels and season with salt and pepper.
- 2Sear the Chicken — Heat olive oil in a large oven-safe skillet over medium-high heat. Add chicken in a single layer and cook for 4-5 minutes per side until golden brown but not cooked through. Remove to a plate – it will finish in the oven.
- 3Sauté the Aromatics — In the same skillet, add mushrooms and onion. Cook for 5-6 minutes until softened and browned. Stir in garlic and thyme and cook for 30 seconds until fragrant.
- 4Build the Sauce — Pour in the chicken broth, scraping up any browned bits from the bottom. Bring to a simmer and let reduce by half, about 3-4 minutes. Stir in the heavy cream and bring back to a gentle simmer.
- 5Add Cheese and Chicken — Turn off the heat and stir in the Parmesan until melted. Return the chicken to the skillet, coating it evenly with the sauce.
- 6Top with Panko — In a small bowl, mix the panko breadcrumbs with the melted butter. Sprinkle evenly over the casserole.
- 7Bake to Golden Perfection — Transfer the skillet to the oven and bake for 20-25 minutes, until the topping is golden brown and the edges are bubbling. The internal temperature of the chicken should reach 165°F (74°C).
- 8Rest and Serve — Remove from the oven and let rest for 5 minutes. Garnish with fresh parsley if desired, then serve warm.
Liam writes about outdoor adventure and gear, focusing on budget-friendly options and safety. He tests equipment in real conditions and shares honest assessments for hikers and campers.
